package com.heima.admin.gateway.filter;

import cn.hutool.core.util.StrUtil;
import com.heima.admin.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        // 1. 获取request和responsex
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        // 2. 判断是否是登录
        if (request.getURI().getPath().contains("/login")) {
            log.info("1");
            return chain.filter(exchange);
        }
        // 3. 获取token
        String token = request.getHeaders().getFirst("token");
        // 4. 判断token是否存在
        if (StrUtil.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 5. 判断token是否有效
        try {
            Claims claims = AppJwtUtil.getClaimsBody(token);
            // 是否过期
            int result = AppJwtUtil.verifyToken(claims);
            if (result == 1 || result == 2){
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            // 获取用户信息
            Object userId = claims.get("id");
            // 存入header
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", userId + "");
            }).build();
            // 重置请求
            exchange.mutate().request(serverHttpRequest);
        }catch (Exception e){
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        // 6. 放行
        return chain.filter(exchange);
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
